Electric motor



(No Model.) G W. NSFIELD,

. ELECTRIC MOTOR. No. 406,922. Patented July 16,1889,

till r mu I I I Il I a v I H| I I r: I I 1/ e mi l llll \w\\\\WHEELER!!!HMHMQL llllll lllIllH UNITED STATES PATENT OFFICE.

GEORGE IV. MANSFIELD, OE CLEVELAND, OHIO, ASSIGNOR TO MATTHEW H.ROBINSON AND ORLANDO A. FOSTER, OF BOSTON, MASSACHUSETTS.

ELECTRIC MOTOR.

SPECIFICATION forming part of Letters Patent No. 406,922, dated July 16,1889.

Application filed February 2'7, 1889- Serial No. 301,137. (No model.)

To aZZ whom it may concern.-

Be it known that I, GEORGE W. MANs- FIELD, a citizen of the UnitedStates, residing at Cleveland, in the county of Ouyahoga and State ofOhio, have invented certain new and useful Improvements in ElectricMotors; and

I do hereby declare the following to be a full, clear, and exactdescription of the invention, such as will enable others skilled in theart to which it appertains to make and use the same.

This invention relates to electric motors.

The object of the invention is to construct a motor as cheaply aspossible with but few parts, and one that shall be extremely simple inconstruction.

With these objects in view, the invention consists in the details ofconstruction hereinafter described, which will be specifically pointedout in the claim appended hereto.

I have illustrated the invention in the accompanying drawings, in whichFigure 1 shows an elevation of a motor constructed in accordance with myinvention, and Fig. 2 represents a side elevation of the same.

In the drawings, A represents the polar extensions of an electro magnetO, the extensions projecting so as to leave a space for the armature B,and being shaped at the lower part into feet K for supporting the motor.These feet may be designed in any way to support the motor, and shouldbe supplied with holes through which screws can be passed to attach. themotor to the floor. It will be observed that the feet K of the motor arenot far removed from the neutral point and the electro-magnet O, andtherefore that but little magnetism will exist at these points, so thatthere will be no dissipation or shortcireuiting of magnetism, eventhough they rest upon a conducting-body, the magnetism all beingpractically contained in the polar extensions A opposite the armature B.The electro-magnet O has a wrought-iron-bar core, to which the polarextensions A are fastened by a bolt and nut I. The polar extensions Aare castin the form shown. Between these two extensions is left a spacefor an armature B, which may be a Gramme ring, or any other suitableform of armature. The said armature is provided with a commutator F anda brush-holder G, all of which is supported by two bearings L and M, theformer of which is sustained by a curved arm D, which is bolted to eachof the polar extensions below the armature. This arm D should be made ofnon-magnetic material or magnetically i11- sulated from the polarextensions, so as to prevent a short-circuiting of the magnetism. Itcould be made of brass, phosphor-bronze, or any other suitable metal.The bearing M is supported by a curved or bow-shaped casting E, each endof which is attached to one of the polar extensions A. It is arranged atright angles to the plane of the arm D. This casting E should be made ofthe same material and the same precautions taken as with reference tothe arm D, before described. It found necessary, a non-magnetic plate Hcan be employed to span the space between the polar extensions, as shownin Fig. 1, so as to afford means for making the structure more rigid. Apulley is placed upon the armature-shaft near the bearing M, so that themotor may be belted to any mechanism. The bearings L and M may beprovided with oilcups, as shown in the drawings. The armature and magnetC may be Wound in any manner desired. This makes no part of myinvention.

It will be observed that the motor I have described is extremely simple,and is composed of but few members, an d those durable and of strongconstruction. It will be evident that such a motor can be manufacturedvery cheaply.

I am aware that motors somewhat similar to mine have been heretoforeconstructed; but none of these has all the good features possessed by mymotor.

Having now fully set forth the construction of my motor, what I desireto claim and secure by Letters Patent of the United States An electricmotor or magneto electric machine consisting; of a magnet having polarIn testimony whereof Inflixmysignnturein extensions between which thearmature is an presence of two witnesses. ranged, with the part of saidpolar extensions near the magnet and neutral point GEORGE W.MANSFIETJI'). 5 fashioned into feet to support the motor, and

the horizontal coil mounted between the poitncsses:

lanextcnsions and attached thereto-near the CHAS. K. STEARNS,

feet, substantially as described. G. R. LAISDELL.

